Method for preparing palladium/carbon catalyst for hydrogenation
A carbon catalyst and catalyst technology, which is applied in catalyst activation/preparation, organic compound preparation, physical/chemical process catalysts, etc., can solve the problems of difficult uniform distribution of supported activated carbon, strong uncertain negative effects, and damage to catalyst performance, etc. Ease of environmental protection, long service life, high microcrystal content
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Embodiment 1
[0037] 100 grams of 4-8 mesh, specific surface 800-1800m 2 / g coconut shell activated carbon is washed with 0.4N nitric acid at 80°C, then washed with water until neutral, and dried at 120°C for 2 to 8 hours for later use.
[0038] The preparation of Pd solution, get 3.4 grams of 15.0wt% chloropalladium acid solution, add deionized water to 40 milliliters, then add 0.78 milliliters of 5wt% 8-hydroxyquinoline acidic aqueous solution, and add deionized water to prepare Pd solution 60ml. After the Pd solution is stable for 10 to 200 minutes, the above treated activated carbon is impregnated with the Pd solution for 4 hours to obtain a catalyst precursor. Aging of the catalyst precursor for 24 hours, using 20 grams of 5wt% hydrazine hydrate and 200 grams of pure water to prepare a reducing solution, immersing the catalyst precursor in the reducing solution for 2 to 4 hours, then washing with pure water to neutrality and drying Catalyst products are obtained.
Embodiment 2~24
[0040] Select different Pd-containing compounds and complexing agents to prepare the Pd solution, and the rest are the same as in Example 1, the specific Pd-containing compound, the content of the Pd-containing compound (in Pd) in the Pd solution, the specific complexing agent and complexing agent The molar ratio with Pd is listed in Table 1.
Embodiment 25~30
[0042] Different Pd-containing compounds and complexing agents were selected to prepare the Pd solution. After the Pd solution was stable for 10-200 minutes, the Pd solution was sprayed on activated carbon to obtain a catalyst precursor, and the rest was the same as in Example 1.
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